Franciscan complex calera limestones: Accreted remnants of farallon plate oceanic plateaus
Nature
By: J.A. Tarduno, M. McWilliams, M.G. Debiche, W.V. Sliter, and M.C. Blake
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Abstract
The Calera Limestone, part of the Franciscan Complex of northern California, may have formed in a palaeoenvironment similar to Hess and Shatsky Rises of the present north-west Pacific1. We report here new palaeomagnetic results, palaeontological data and recent plate-motion models that reinforce this assertion. The Calera Limestone may have formed on Farallon Plate plateaus, north of the Pacific-Farallon spreading centre as a counterpart to Hess or Shatsky Rises. In one model2, the plateaus were formed by hotspots close to the Farallon_Pacific ridge axis. On accretion to North America, plateau dissection in the late Cretaceous to Eocene (50-70 Myr) could explain the occurrence of large volumes of pillow basalt and exotic blocks of limestone in the Franciscan Complex. Partial subduction of the plateaus could have contributed to Laramide (70-40 Myr) compressional events3. ?? 1985 Nature Publishing Group.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Franciscan complex calera limestones: Accreted remnants of farallon plate oceanic plateaus |
| Series title | Nature |
| DOI | 10.1038/317345a0 |
| Volume | 317 |
| Issue | 6035 |
| Year Published | 1985 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Nature |
| First page | 345 |
| Last page | 347 |
| Google Analytic Metrics | Metrics page |